We have used high resolution angle resolved photoemission to measure the Be 1s core level spectra. Similar to a previous angle integrated photoemission measurement [1] four peaks are observed and can be identified as three surface peaks...
moreWe have used high resolution angle resolved photoemission to measure the Be 1s core level spectra. Similar to a previous angle integrated photoemission measurement [1] four peaks are observed and can be identified as three surface peaks and one bulk peak. Large relative intensity variation of these four peaks as a function of photon energy and emission angle reflects the diffraction of photoelectrons by neighboring atoms. Wide photon energy range from 120 to 280 eV and three emission angles of 0, 20 and 35 degrees are chosen to cover four major diffraction features. Comparison with a multiple scattering simulation calculation enables us to determine the first three interlayer relaxation. The results will be compared to that from a LEED-IV measurement. [2] The temperature effect will also be discussed. [1] L.I. Johansson, H.I.P. Johhansson, J.N. Andersen, E. Lundgren, and R. Nyholm, Phys. Rev.Lett. 71, 2453 (1993). [2] H.L. Davis, J.B. Hannon, K.B. Ray, and E.W. Plummer, Phys. Rev. L...
